I believe there have been several shifts of management since then, and perhaps they're no longer considering such intrusive methods for "management" of external VoIP traffic. I have no idea if they actually ever implemented such tactics, but it would occur to me that a few tests would show suspicious behavior.
I don't know what QoS policies that they might have in place, however I know Intel testers were specifically running skype tests in moving vehicles to see how well the calls stayed up during handoffs between cell towers. Latency and jitter in the DC area has been pretty stable so voip is doable. I've only tried with a built in card on my laptop, I haven't tried via tethering to an EVO or their USB stick. The base station they sell that hands off ethernet might be the best option so you can have a fixed install where the signal quality is best. ~Jared